NEXT_P_INTRMASK
(*(volatile u_long *)IIOV(NEXT_P_INTRMASK)));
((*(volatile u_long *)IIOV(NEXT_P_INTRMASK)) &= (~NEXT_I_BIT(x)));
(*(volatile u_long *)IIOV(NEXT_P_INTRMASK)));
*(volatile u_long *)IIOV(NEXT_P_INTRMASK));
intrmask = (volatile u_long *)IIOV(NEXT_P_INTRMASK);